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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836fbe30034ce2b2d1a0db5835c99bcfd518307e1c68b44e23f5c4af4ca669cf' 
  AND token = 'Jq6BAxCeQc1kx1ZveoM2cOZ83iWRWUr/BxvGYLnqT54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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