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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ab6197297348a1ac864e8475a63ca60bcb8d8efdce34be705ac504d9ecdd1a' 
  AND token = '0voGvfgTCRCZ4phgu8v2Fri/qODAscfKgB8L8ujGsZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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