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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d2914e5289e9d1bacf044b6c81ac8b2354f6e3787d18e98ebd4f7f752359a2' 
  AND token = 'QbBzYwd7zoKEfiGRFdmdrvaeiIUAquHRgczWSKidN4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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