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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da31732d5cc6ac52e02b6529ac7fb95f29181d545714d2aa18dc9505b8660ec' 
  AND token = 'NbcpOGM9RCUBQ+G7m9z4wjUb1H+cLmvcB2ggDgJwBWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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