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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4677df78c269d93fdd6add3a62a0031af4c8c9edbf946b99c01ee2a2a56ba411' 
  AND token = 'yghIKfZfhDWACFqREuHTbDVGvMed2iOeQCVp9SWSJjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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