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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0225f3a8e271ac08c94e9f71a6f22562f4bf1939d49941f0a9138bb0bcb5fe' 
  AND token = 'M03lZhuIM7ZvwNYPCYBPcIfL61LWsfUb/EyQl4SOXXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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