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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae2db35a0c15a178897612e1724c2fd559774cc998bc31d913bc43155f44283' 
  AND token = '7+TbAFJW+Zi7VaQromcR0b4y/07DTEIa9p5gQymdcFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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