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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bed3fb5e98b29005264f9be5754fd94c89ef71d106d0b20213d9e9f987356e' 
  AND token = 'f0hm4eCyBUuReIgN6wB3BJAEVu2w6pv95jMhL2wGV1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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