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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb6054df039f6fa3ecd780f9f28f7b03747fb179dc947904710a69f956cf20f' 
  AND token = 'pkYxVvqTTyp+jBN37r01qdrpL4sDaM0U1HbZDdBMyXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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