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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5419b4a0040d8cdc9aab84145030171347e5d7eca117c993453924b560374d4' 
  AND token = '8X09DAAWKBe0RG+6N7fJ6HnsjJ9OxMZc+VqG8EBiyhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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