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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334f24d2925c9c7f9ee5642f311a03131a1ce1e01ffc10e6153c8a82583acd84' 
  AND token = '1nhpqE2W6Kl5hEoqy+wUkv4uNBZwRCAQAwS2RyJznac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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