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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ce762f2200eb068e0f279e6bb0a75346cf61f063514481387d6d000cd35d6e' 
  AND token = '9S0e23sWQiU9S2S/SkxRw6sSSAeF+0Nn9PDDDXxm13Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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