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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bd68468b04de00ed5779bd5434bf819c82f4a1d7e00f5f5882b80af062326d' 
  AND token = 'sJUI8dgy/zl+Dt/K0d+EUkKGh72IK1FA6hmsbzRIl0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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