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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cd5253b0dffa11c610c7685cf35caea56f51946dc50b8bf0eeea91e0565503' 
  AND token = 'nDqn777cchVIEsL+qNrhejD4dnpq9fbEo35QYp2m2EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}