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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63fdc5863db07b7e57933ee35fa6132de52ceeed16f58ae02fa3819a67132b3' 
  AND token = 'nWFSg9qQV3ZIW6q+t+Sc/1nAQaxauALoybWDjG2VeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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