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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e374aa478fa4cc7fa54ec155f2cf97e23cd95b60a9798c093f8712e42a92b11b' 
  AND token = '4gNG9Hb8jCyaAc5kqk/fR9pxnemKU5feKYKrqM6vEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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