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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c5ab895f01461f1f45a6329ce680ab57a0bc7b485c1a2f3984263a20fbe9c1' 
  AND token = '9ETyaKsOFNGjNqU8Cs8SbxRTTiU75S20MZre406HhEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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