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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eadaedca91c205002cb072a25e8c333b97e0107f8e24c0b5ecb0e58681197c' 
  AND token = '94vXB1Wni61dh9b4biEEEr/x/kRex60PP1x5THCl+Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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