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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2984d0298a0c99211dccb752cc96fe35f02652781214238c619e9b3751f3ba' 
  AND token = 's1d15yrtvHkVUneSgKi8whab3zeFh/DFnjjCsDbW+0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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