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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2d5525a4ac5d4538c1ca73edac2d1bf62b6beeb9e8afc695afa19d724af985' 
  AND token = 'mKOvvLIeAawiBBwjI5AeB9OEiLA1nCPfDIUKos9wgKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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