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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1a8e1226c6700e7e5cd16e5630b7de1da30752f970e989e7971f204450bb53' 
  AND token = 'oIRrPaivbRhVx28RtgcMBXOpxX/mKhmcj3mn29chphs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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