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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3515e1ac497af74872532dce86a00c61a97f3776927c9ce847396ddd9b55c439' 
  AND token = 'T6PTp386kgNkgQa+3cf6glcnYNuJRISVdHrrmA/Kk34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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