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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3149358b83f4f4dba2e5e79a0c4033f14afa206fffd188bd826de9d0854e4d' 
  AND token = 'k/DVxOVrqEgRNfxNC7DD5kP0l59g5moUAL95MUjGW94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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