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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592be1af6afa0f28738db5ebf07e0daf9d1189782806dbc0f8cb40838db7e615' 
  AND token = 'q0CEhl3I8dvfiilyCCMtZWY57NwwPMVCCHNxi3uIuvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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