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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a222586f5fd4f0c5fd39676c533666dd2675455e10ef6d82c08b3855d862875' 
  AND token = 'lzLhBWenZQ0IrVlcXjg6Y4RFmAu7KcNPOG9J0Afk8s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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