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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c66a8c7b911bd3f33d631124729cf5e62ddcc3bdc0b1659f77595a5b9d2b8c' 
  AND token = 'Rr3V9l4F0jE9GJOAbHGYGig0xuHdd0C/PRJ0dfL6ngo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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