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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dabe020933787ddf002fc14e61d5ea696cc28292b12235d8902855624961f8' 
  AND token = 'XL6Y1liokWCBHXaJoP5sgInsBJPUkqoOGQuEpASi1aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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