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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe74e628e0a607a54e30b2d048c64e7f5509800cbbd55a21de7ddd9bcd1e216e' 
  AND token = 'c3B7GnZEl4XpgRebz2zC+9Y0lZnBrAw5TeMF22QBLKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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