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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7004cef3e9ad9502ec250676fd4005ada359f8b3a720c08032ad6a968fe817a' 
  AND token = '9pSLLyumzq6h8+SNyYj3S5jlhx/HHcE/dPOsentsCzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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