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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79efc661352114c958c461d5418d49497b38eea6b9755194894b72e750c040a1' 
  AND token = 'Y8c02+IDGq5S7NiPGFM6BkNgrgao2cNSMuotJILwcHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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