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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2747604ec776fee15def28e4843e5db0e0c97e40abf7a28d99796b4b71ae2577' 
  AND token = 'cIg5yYON+2f4n45PwMcgPMaNhmbbeQpJC6RA03/cOH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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