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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ab372ada7c61ed0d5a16c0ac0673b29cc0275c300697e3d6594cac714876f7' 
  AND token = 'xJ60UjhNadUeAFfb1ua3+Koujm3DyD413XS3eu7feN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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