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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6006d5a8838cf534a13dcea60f7c5ceb909d0d344eddd1a5eabf3e6238543a' 
  AND token = 'jz9bXK4dLEZwTWn2rlagL7qhNem1rhey3I9rlFWL+14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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