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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ae72ce091e6ef613dc08b68a5cd8f7c4ed5dde614d28f11e82e45d45a5eb95' 
  AND token = 'wzW6YG106qopkdu5ckj1EtwloL1EAvLtDtXMKfpY/aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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