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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d91ad51929a98bb466b8ebecc1f5ed0028c1f6aa4343866547d10dbe41432a0' 
  AND token = '2ntWXtqydAhq1aXGAzxubkJdm4pCeP5TFpGlyojrO2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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