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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d80bc668bbaab2d0e7370a9a52f9addb04b52195712ff37e4cb62d2f5262a39' 
  AND token = 'lef8Lic3CwGGxD4Rn3yQ5OVKYSh/SNhsNW2Bh18y2uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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