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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3c6a720275c5d9019acbaa25d3d30814a88e948ea2440f44cea64d1f73377e' 
  AND token = 'PveR0b2NvC5gI9I9bkbDaP4RNNYAktNvkb/qPIURgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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