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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1bf30fdcd830f9f410ec4770ce0ad30892f64189f34a6d40250ccf6d859283' 
  AND token = '4BJIuEa9H6oV1XwDCI8S4raZKEsDhl70FRFF1qSLGrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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