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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d85ddffefa29914b3ad0d3bd74e346c0d7033c993db17a2c39f9031e627c2e8' 
  AND token = 'yq4MVJEQXEhinAIrAnMo9iUC6Nsh+ASB6jlynFfx39Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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