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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0571ef443e0238744b77f9f45bb1ea5f0396f26e20f669d1423502a1f5625f' 
  AND token = '2XRpthKrz1bT5g0THhexFSFyE/S259yrN9xIVV/W35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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