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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a0ea69a01cc54bdd77323b134ce6643c322331c608f1fd76aea776976e81a8' 
  AND token = 'soSfxN7RRXM8+g8D8TK14aKlMP7UgI5mDbrp+XBxABg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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