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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aabd5480d8e6a70937caf5965c5db5f55b57d6a7d2b4b4b234f4599e045f84a' 
  AND token = '3WB187ivyPeIhUqb8rN6Et333mRmpjf8h5ucC1Krm10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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