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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e986fb0ab5c0543245a09eff7f3e57b652c2b1d0870a063b9a135b4dcddb3d2' 
  AND token = 'dnMff4IyDl1BMSwiLTp54vz2fZCugMZNi23+QD+ZjUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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