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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb82cc3b2684d585e36b8e78f08d1065caecda0192c80fdfaab01b3f68e1909' 
  AND token = '+LdwP48OgnwUNVqT8dViNJwZI4csQpcVZp2DbPiCT9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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