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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b34e1a28849bdaf9a66dd8ddeeb23e20f8f2ef477247a0d2074903e4e876d68' 
  AND token = 'etatYODpRGjabV6BZp2BeU80e+mmO5BhxMrEGNLkgts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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