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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4601fa06b43d0f746e7ff2ca2290428cec9eb55b4a2359301ab93844fbc4d18' 
  AND token = 'DKfrq2q7KHME5jXbVnNOEhZm8an5Qv95VhfZPF8aO18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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