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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da231c21766d75a359a7fa579515e547f0824e2e41460e91e58b9fd5d397b6bf' 
  AND token = 'VRQDOqymAf/+Pd3BHGb6o7ViT50uL1L9sFE+pMN5PAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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