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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a0d37becdcbc9a3ca251c0e94a3b15badba2c2191d9b9bf0691a9bc48012be' 
  AND token = '9xCRnBRFEGr3UBwcBu2l1a0HyN4kP08OengjXhkQwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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