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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5e57d6216399b02541547cd51383d1ce08c307b071c7a345a042cb714db073' 
  AND token = 'rMMUA/lHxxR6zZnw0syQ4jXeroAW9chQYWu97Z8GNZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00467

JSON explain

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