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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad19897ff60c746273e71ea6186f43822d827723643178ef65ab6b4545c73cb' 
  AND token = 'enqf31aG5cg2dScml81EZ4KC29eP4XwBx7IPSuhxl7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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