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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8d4a18462ba2c8d4060ea86d894115b99adf492ad4779d3923e16b2d91c4c2' 
  AND token = '082x0/Um17wqAH1/q0FDnNl58in+alwu8qu49xRB6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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