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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5b2ed860b0554b4556f4f837f7b1184844ed548ef0f7b9befd0230826adceb' 
  AND token = 'ukXFQ4U0AGeyGCefH7p21FjnsS8klrWkd80ne5Fjts4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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