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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e6e9d7540c00a33fdf33b2c753d9f42ff9f86a7d580c862d980e81ebf09c83' 
  AND token = 'nrIhy/TPQnwt1FG32V601YePfA+TpylO6ZsL7WOPjNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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