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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889e02a85cd68754706ada4e6620cda56ffc655c206009a796bc57b2259baf57' 
  AND token = 'VbcXbJKz73usHhk1dh0Q3LZL+OCcAC9ibKcs1+3vIRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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