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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb299c78dc2b3c96930649e25ad875c04c1ca621b6b48d8703ecab39e86cbac2' 
  AND token = 'dfoo66vV1IkNDzxe0oqAciz/kQOPYEAuOnTUrkl6i64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00189

JSON explain

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