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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2edac2029f69fc1ac040d4bbfe81e521a2266461fb094cd9896bbbb317fc55' 
  AND token = 'AKuatnJ2D+N0aS2cKW3foWk5/68vFoNabvu7QI1T4Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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