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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f2e16447550b51a5cd535730c3673116ad48da62d7cf9fbd5764c3f3e0629e' 
  AND token = 'B2gBCn86Ve9YQq1AlPUbnzjciBD2X7FI3+NbH5TrAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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